[20191230]rhel 7.7 bash_completion如何启动.txt

# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.7 (Maipo)

# rpm -qa --last | grep bash
bash-4.2.46-33.el7.x86_64                     Thu 05 Dec 2019 02:13:53 AM CST
bash-completion-2.1-6.el7.noarch              Thu 23 Aug 2018 11:42:08 AM CST

--//已经安装bash-completion,但是我发现没有起作用.看了一下文档,必须手工加入

#  vim /etc/bashrc
...
# Use bash-completion, if available
[[ $PS1 && -f /usr/share/bash-completion/bash_completion ]] && \
    . /usr/share/bash-completion/bash_completion

--//顺便下载并安装了bash-completion-extras包.
https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/b/bash-completion-extras-2.1-11.el7.noarch.rpm

--//主要目的是方便学习systemctl命令.

# systemctl
add-requires           default                halt                   kexec                  mask                   reset-failed           status
add-wants              delete                 help                   kill                   poweroff               restart                stop
cancel                 disable                hibernate              link                   preset                 set-default            suspend
cat                    edit                   hybrid-sleep           list-dependencies      reboot                 set-environment        switch-root
condreload             emergency              is-active              list-jobs              reenable               set-property           try-restart
condrestart            enable                 is-enabled             list-sockets           reload                 show                   unmask
condstop               exit                   is-failed              list-timers            reload-or-restart      show-environment       unset-environment
daemon-reexec          force-reload           isolate                list-unit-files        reload-or-try-restart  snapshot
daemon-reload          get-default            is-system-running      list-units             rescue                 start

--//感觉systemctl搞得很复杂!!